Compact Muon Solenoid
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| CMS-PAS-HIN-25-010 | ||
| First measurement of pseudorapidity distributions of charged hadrons in oxygen-oxygen collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.36 TeV with CMS | ||
| CMS Collaboration | ||
| 2025-09-08 | ||
| Abstract: We report the first measurement of the charged hadron pseudorapidity ($ \eta $) distributions in oxygen-oxygen collisions at a nucleon-nucleon center-of-mass energy of $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.36 TeV. The data were recorded by the CMS experiment at the LHC in 2025. The yields of primary charged hadrons produced in the range $ \lvert \eta \rvert < $ 2.4 are reported using the CMS silicon pixel detector. The midrapidity particle density as a function of collision centrality is also reported. In the 5% most central collisions, the charged-hadron $ \eta $ density in the range $ \lvert \eta \rvert < $ 0.5 is found to be 135 $ \pm $ 3 (syst), with negligible statistical uncertainty. The data are compared to previous measurements of lead-lead and xenon-xenon collisions at similar collision energies and several Monte Carlo event generators. Detailed studies of the dependence of particle production on the collision energy, initial collision geometry, and the size of the colliding nuclei are presented. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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